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The 63-ply stainless steel has an original thickness of 20 mm and is thinned by repeated rolling to a thickness of 2 mm. You might want to look at this rolling process as a modern forging technique. Also, this rolling process removes all the impurities in the steel leaving you with a very hard, very pure stainless steel. After the rolling processes, the V-G No. 5 cutting edge reaches a hardness of 58-60 degrees on the Rockwell scale and a final thickness of .65 mm. The outside layers each reach a thickness of .675 mm.
There are several different VG stainless steels. Kataoka selected V-G No. 5 stainless steel for the SAN KYOTO knives, because V-G No. 5 can be hardened as hard as any of the other V-G steels but has superior edge retention. Using scientific testing equipment (CATRA), Kataoka was able to show that their knives stayed sharper longer than knives made from other VG steels.
The edge on the SAN KYOTO knives is a minute, beveled edge. The angle of the edge is between 14 and 15 degrees. To appreciate the quality of the edge, you must first look at its incredible mirror polish and then try cutting with it. Kataoka has achieved the perfect balance between sharpness and strength with the SAN edge.
The SAN KYOTO knives are balanced with a stainless steel weight which attaches to the tang and is visible at the heel of the handle. Not only does this add to the beauty of the SAN KYOTO design, it also creates fantastic balance.
Manufactured by Kataoka and Company in Niigata, Japan.
The knife from the Tamahagane SNM series is 3 layers of steel: the middle of the blade is made of hard, but fragile VG5 steel, which is supplemented with 2 layers of mild steel, making the blade very strong, hard, but at the same time retains its flexibility and does not lend itself to distortion and kinks. The knife is fully balanced and very easy to use in any kitchen.
After the rolling processes, the marerial of VG5 becomes harder and harder to be 61 degrees Rockwell Hardness in the final thickness of 0.65 mm. Meanwhile, the two outside layers of SUS410 will remain at 28 to 32 degrees to strengthen the blade and protect against damage and corrosion.
Sharpness is is the outstanding feature of the knife. The blade is sharper and remains sharpness longer than normal knives.